package sqlparser;

import java.util.ArrayList;
import java.util.List;

public abstract class BaseSingleSqlParser {

    //原始Sql语句
    protected String originalSql;

    //Sql语句片段
    protected List<SqlSegment> segments;


    /** */
    /**
     * 　* 构造函数，传入原始Sql语句，进行劈分。
     * 　* @param originalSql
     */
    public BaseSingleSqlParser(String originalSql) {
        //System.out.println("调用了BaseSingleSqlParser的构造函数");
        this.originalSql = originalSql;
        segments = new ArrayList<SqlSegment>();
        initializeSegments();
    }

    /** */
    /**
     * 　* 初始化segments，强制子类实现
     * 　*
     */
    protected abstract void initializeSegments();


    /** */
    /**
     * 　* 将originalSql劈分成一个个片段
     * 　*
     *
     * @return
     */
    public List<List<String>> splitSql2Segment() {
        List<List<String>> list = new ArrayList<List<String>>();

        //System.out.println("调用了BaseSingleSqlParser的splitSql2Segment方法，用于分割sql为不同的模块");
        for (SqlSegment sqlSegment : segments) {
            sqlSegment.parse(originalSql);
            list.add(sqlSegment.getBodyPieces());
        }
        return list;
    }

    /** */
    /**
     * 　* 得到解析完毕的Sql语句
     * 　* @return
     */
    public String getParsedSql() {
        StringBuffer sb = new StringBuffer();
        for (SqlSegment sqlSegment : segments) {
            sb.append(sqlSegment.getParsedSqlSegment() + "n");
        }
        String retval = sb.toString().replaceAll("n+", "n");
        return retval;
    }

}
